with ( v = (1,01) ) and ( w = (1,5) ) choose a number ( c ) so that ( w-cw ) is perpendicular to ( v ). then find the formula for ( c ) starting from any nonzero ( v ) and ( w ).
a) ( c = 1/5 )
b) ( c = 5/2 )
c) ( c = 2 )
d) ( c = 5 )